Question: How to refer to previous result?

I want to reference the previous equation/expression which is not displayed (':')in my worksheet. I allready know the '%' sign, but this references the previous equation/expression which was executed . By previous I mean the result (which is not displayed) in the previous line.

As I do not want the previous equation to be displayed I also cannot use the equation lable (CTRL+L).

 

Example

x:=a=b+1:

solve(previous,{b});

 

Thank you for your help.

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